In 1965, scientists cut every tree in a New Hampshire watershed to determine how removing forest cover changes water supply; first-year streamflow rose about 40% and second-year nitrate topped 50 mg/L

In 1965, scientists conducted a groundbreaking experiment in New Hampshire’s Hubbard Brook watershed by felling trees. This experiment uncovered a remarkable increase in streamflow and an earlier onset of snowmelt. Alarmingly, nitrate concentrations surged, surpassing safety limits for drinking water. The findings underscored the vital function of forests in managing water and nutrient retention, and the watershed continues to be monitored more than sixty years later.
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